How to get indexof a Bitmap image? - actionscript-3

Question

I am having a hard time to get an index of a bitmap image. I am not sure how should i suppose to do it.
What i am trying to do is:
1.)Loop a URLRequest and load bitmap pictures.
2.)Put them in individual _contentHolder
3.)Put everything in a viewport
4.)Check the index of the image when its clicked
Thanks for your time
Code
public var _contentHolder:Sprite = new Sprite;
public var _contentHolder1:Sprite;
public var loadedArray:Array = new Array;
public var blackBox:Sprite = new Sprite();
private var somedata:Array;
protected var Holder:Listing9 = new Listing9;
public var viewport:Viewport = new Viewport();
public var scroller:TouchScroller = new TouchScroller();
var my_url:Array = somedata;
function loadImage():void
{
somedata = SearchVectorTest.lists;
for (var i:int = 5; i < somedata.length; i++)
{
if (somedata[i])
{
var loader:Loader = new Loader();
loader.load(new URLRequest("http://www.rentaid.info/rent/" + somedata[i]));
loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onImageLoaded);
}
}
}
function onImageLoaded(e:Event):void
{
loadedArray.push(e.currentTarget.loader.content as Bitmap);
for (var i:int = 0; i < loadedArray.length; i++)
{
var currentY1:int = 200;
e.currentTarget.loader.content.height = 200;
e.currentTarget.loader.content.y += currentY1;
currentY1 += e.currentTarget.loader.content.height + 300;
_contentHolder.mouseChildren = false; // ignore children mouseEvents
_contentHolder.mouseEnabled = true; // enable mouse on the object - normally set to true by default
_contentHolder.useHandCursor = true; // add hand cursor on mouse over
_contentHolder.buttonMode = true;
_contentHolder.addChild(loadedArray[i]);
}
var viewport:Viewport = new Viewport();
viewport.y = 0;
viewport.addChild(_contentHolder);
var scroller:TouchScroller = new TouchScroller();
scroller.width = 300;
scroller.height = 265;
scroller.x = 10;
scroller.y = 100;
scroller.viewport = viewport;
addChild(scroller);
_contentHolder.addEventListener(MouseEvent.CLICK, gotoscene);
}
loadImage();
public function gotoscene(e:MouseEvent):void
{
BitmapArray.push(loadedArray);
var index:Number;
index = BitmapArray.indexOf(e.target);
trace(index);
trace(_contentHolder);
trace(_contentHolder.parent);
blackBox.graphics.beginFill(0x000000);
blackBox.graphics.drawRect(-1, -1, stage.width, stage.height);
blackBox.alpha = 0.7;
addChild(blackBox);
Holder.height = 300;
Holder.width = stage.width;
Holder.x = 0;
Holder.y = 100;
trace(blackBox);
trace(blackBox.parent);
addChild(Holder);
}
function gotoscene1(e:MouseEvent):void
{
removeChild(Holder);
removeChild(blackBox);
}